Need it. Practicing mathematics in one lesson and practicing it in three lessons is a method of repeated practice. Teachers can master mathematical knowledge and skills by practicing similar topics repeatedly, and improve their problem-solving ability and thinking ability. By practicing mathematics in one class and three exercises in one class, teachers can keep abreast of students' mastery of knowledge points. If students make mistakes or puzzles in practice, teachers can correct and answer them in time to help students better understand and master knowledge.